Shaker screen



Nov. 17, 1942. s. B. DAVIES 2,302,193

SHAKER SCREEN Filed April 30, 1940 2 Sheets-Sheet 1 Nov. 17, 1942. s B, DAVlEs 2,302,193

SHAKER SCREEN Filed April 30, 1940 2 Sheets-Sheet 2 vj yka amen WM Patented Nov. 17, 1942 UNITED STATES PATENT OFFICE SHAKER SCREEN Stanley B. Davies, Kingston, Pa., assignor to Royer Foundry and Machine 00., Kingston, Pa., a corporation of Pennsylvania Application April 30, 1940, Serial N 0. 332,545

7 Claims.

The present invention relates to sand conditioning apparatus and refers particularly to a combined sand screening and sand treating mechanism for reconditioning used molders sand.

An object of the invention is to provide an improved operating mechanism for transmitting power from the sand treating unit to the screen. In the present construction the sand treating unit comprising a rapidly rotating belt and the screen is mounted above the belt and adapted to initially receive the used molders sand, screen it to remove scrap and other refuse, and permit the screened sand to fall upon the sand treating belt. One of the belt supporting and rotating shafts is provided with an extension which supports cam mechanism. An operating rod has one end connected to the cam and the other end connected to the screen by a universal or ball joint. The screen is also pivotelly mounted on ball joints and I have found that the combination of the cam mechanism and the ball joints provide an effective operating means for transmitting shaking motion to the screen.

A further object is the provision of a screen supporting frame which may be easily and quickly attached to the sand treating unit.

Another object is to provide means for adjustably mounting the screen in its supporting frame to vary the inclination of the screen as desired. This means takes advantage of the universal action of the front ball joint whereby the rear end of the screen may be adjusted about this joint as a pivot.

Still another object is the provision of a screen supporting frame for detachably mounting the screen in operative position whereby screens of different mesh may be inserted in the frame, depending upon the type of sand to be reconditioned.

With the foregoing and other objects in view, the invention will now be more fully described, reference being had to the accompanying drawings in which:

Figure 1 is a side elevation of the apparatus partly in section;

Figure 2 is a top plan view of the screen and its supporting frame,

Figure 3 is a fragmentary end view of the apparatus;

Figure 4 is an enlarged detail of one of the ball joints, and

Figure 5 is an enlarged sectional view of the screen and its supporting frame.

Referring now to the drawings, the numeral comprising a sand conditioning or treating unit II and a screening unit l2 detachably mounted on the unit H, as will be hereinafter described in detail. The unit II will be described only briefly, since it comprises generally the apparatus shown in Patent No. 1,559,915, Boyer, November 3, 19215. The present unit comprises a main frame [3 upon which is supported a sand treating belt M. This belt is mounted upon front and rear rollers l5 and I5 respectively, the shaft ll of the front roller being connected to and receiving power from an electric motor [8 through any desired means, such as a belt. As is usual in this type of apparatus the belt i4 is rotated at a high speed so that the particles of sand or other 7 material which are acted upon by the belt, are

IU designates generally the present apparatus 55 thrown from the top of the belt by centrifugal force, which performs an aerating action upon the reconditioned sand. A deflector I9 is ad ustably mounted on the front 01 the frame, so that the discharge of the reconditioned sand may be controlled as desired. This sand treating unit is also provided with a hopper zu Wl'llCn 15 adapted to receive and direct the sand upon the belt l4.

The screening unit lz comprises a main frame consisting or front and rear uprights ll and 22 respectively. The front uprights are connected to a front cross bar 23 While the rear uprights are connected to a rear cross bar 24. A pair of ball joint hangers 2b and 26 depend from and are supported centrally of the cross bars (see Figures 1 and 2). The front hanger 2c is provided with a shank 21, the free end of which is threaded to receive a nut 23 by which the hanger is detachably connected to the front cross bar 23.

Referring particularly to Figure 4, it will be observed that the hanger 25 has formed therein a ball receiving socket 29 having a central opening 30 of less width than the diameter of the socket. A ball 3| is mounted in the socket 29 and has a tapered shank 32 which projects through the central opening 38 and is detachably connected to a bracket 33. A cover plate 25' is detachably secured to the outer end of the hanger 25 and is provided with a curved surface 29' cooperating with the curved surface of the socket 29 to form a bearing for the ball 3|. This cover plate also prevents the introduction of dust through the outer end of the hanger as well as preventing the accidental removal of the ball 3|;

end of a screen supporting frame 35 and projects upwardly therefrom as shown in Figure 1. A similar bracket 36 is connected to and depends from the rear end of the frame 35 and is likewise provided with a tapered opening for receiving the tapered shank 37 of a ball 38. The ball 33 is housed within the hanger 23 and since this hanger is similar in construction to the hanger 25 it will not be described in detail. This hanger is detachably connected to the rear cross bar 24 by reason of its shank passing through an opening in the cross bar and engaging the nut 39.

The screen supporting frame 35 is of substantially rectangular shape and is of angle iron formation in cross section. In other words it is substantially L-shaped in cross section, being provided with a lower flange 46 upon which the screen ii is supported. This screen may be of any desired mesh and as shown in the drawings (see Figures 1 and the wires forming the screen are secured to a channel-shaped frame d2 which rests directly upon the flange to of the frame 35.

It will be observed that the screen is mounted for shaking movement about a longitudinal axis in the ball joints formed by the sockets and 26 and balls 3i and 38. The shaking or rocking movement is adapted to be imparted to the screen and this motion is transmitted from the sand treating unit. As shown in Figures 1 and 2, the front roller (5 is mounted on the shaft H and this shaft is provided with an extension 43 projecting outwardly at one side beyond the belt Id. An eccentric or cam 43 is fixed to the shaft 53 and is embraced by a circular strap 65 connected to the lower end of an operating rod 45. To the upper end of this rod is connected a casing or hanger 5'! similar in construction to the hangers 25 and 25 and likewise provided with a substantially spherical socket for receiving the ball 53 (see Figure 2). This ball is provided with a shank 2-8 connected to the outer end of a bar 50, the inner end of the bar being secured to the front wall M of the screen hopper 52. This hopper is also provided with side walls 53 which are inclined inwardly and downwardly toward the rear of the machine. The hopper is secured to the screen supporting frame 35 and is adapted to retain sand within the confines of the screen &2 during the screening operation.

With the construction as thus far described, operation of the motor [3 will rotate the belt I4 and the front shaft E7 of the sand treating unit ll. This will likewise rotate the eccentric 54 and impart an oscillating movement to the operating rod t6, which in turn, transmits a rocking or shaking movement to the screen through the ball joint M, 48. In this connection I have found from actual experience that the eccentric throw to this ball joint transmits a very effective shaking action to the screen. The ball joints 25 and 25 also cooperate to provide an efficient construction.

Since the screen is rocked about the longitudinal of the ball joints 25 and 23 the path of the outer end of the bar 58 will describe an are, as distinguished from a straight line. To compensate for this movement and to avoid any binding of the operating rod 6 in its oscillating movement, the lower end of this rod is pivotally connected to the strap 45 instead of being rigidly secured thereto. Referring particularly to Figures 1 and 2, it will be observed that the strap is provided with an integral lug or projection 5 which is received between the arms of a clevis 55. A pin or bolt 55 passes through and connects the clevis to the projection 54. It will be observed that the axis of the pin 58 is transverse to the axis of the shaft H and thereby permits a limited transverse movement of the operating rod to compensate for the arcuate movement of the outer end of the bar 59 during the shaking of the screen.

By reason of the particular construction of the ball joints 25 and 26, the balls SI and 38 may be removed from their sockets for replacement and this operation will also detach the screen frame 35 from the cross bars 23 and 24. This is accomplished by removing the nuts 32 and 36 from the shanks of the balls and also the cover plates 22% from the hangers. Thereafter the balls may be slipped out of the sockets or housings whereby the screen may be removed from between the front and rear cross bars. It will also be observed that the screen and hangers may be removed as a unit from the frame by removing the nuts 26 and 39 from their respective shanks.

If it is desired to change the mesh of a screen, this may be easily accomplished by removing the screen and its frame 42 from the supporting frame Referring to Figures 1, 2 and 5, it will be obs rved that the upper end of the frame 35 has formed thereon a pair of spaced lugs 58 which project inwardly over the top of the screen frame The rear end of frame 35 is provided with a pair of threaded openings for receiving screw bolts 59. As shown in Figures 1 and 2, when these bolts are screwed into the frame 35 their inner ends engage the rear end of the screen frame s2 and force this frame forwardly against the front of the frame 35, thereby rigidly clamping frame 52 in the supporting frame. When it is desired to replace a screen with one having a different mesh, it is necessary merely to unscrew or remove the screw bolts 59. Thereafter the screen may be removed by grasping the rear end of the same and swinging it upwardly so that its forward end will clear the lugs 53. It will be apparent that a new screen may be quickly inserted into the frame 35 by first slipping the forward end of the screen frame under the lugs 58 and then lowering the screen upon the frame 35. Thereafter the screen may be rigidly clamped in this frame by tightening the screw bolts 59.

Depending upon the condition and type of sand which is to be operated upon, it may be desirable or necessary to change the inclination of the screen to meet varying conditions. Means are provided to accomplish this and includes sets of arcuate holes or openings 60 adjacent the upper ends of the rear uprights 22. The rear cross bar 24 is provided with end flanges GI and each flange has formed therein a hole or opening so positioned that it will register with each of the holes in its respective set of arcuate openings 69. Suitable fastening elements (52 such as nuts and bolts, are provided to detachably connect the rear cross bar 24 between the uprights 22. With this construction it will be observed that the universal movement of the front ball joint 25 is utilized in providing for the adjustment of the screen in the frame. In other words the screen, when adjusted, is moved about this joint as a pivot. It will be apparent that the screen may be easily adjusted by loosening the fastening elements 62 and either raising or lowering the rear end of the screen frame so that the openings in the rear cross bar 24 will register with a set of holes in the uprights 22. Thereafter the fastening elements may be inserted through the new set of aligned openings and tightened.

While the present construction is adapted to accommodate different types of material, it is particularly designed for reconditioning used molders sand. When the used sand is deposited upon the screen, there is usually a quantity of scrap metal or other pieces of material which are too large to pass through the screen to the sand treating belt. Becauseof the shaking action and the inclination of the screen this material will gradually move downwardly toward the rear end of the screen. In order to facilitate the removal and discharge of this material from the screen, there is provided a platform or plate 63 which extends entirely across the rear of the screen and is fixed to the rear end of the screen frame 42. As will be observed (see Figures 1 and 2) this plate is fastened intermediate its ends to the frame 42 so that a portion of the plate projects downwardly into contact with the screen proper. The rear end of the plate overlies the rear cross bar 2 so that the scrap material when it reaches the lower end of the screen will ride upon the plate and drop clear of the rear end of the frame. Any suitable means (not shown) may be positioned in the rear of the apparatus for catching the scrap and other material from the plate 63. It is to be understood that there is suihcient clearance between the rear end of the plate and the rear cross bar so that the plate will not contact the cross bar or any other portion of the frame when the screen is in operation.

A rear bafiie plate 65 is secured to and depends from the rear end of the screen supporting frame 35. This bafile is adapted to direct the sand passing through the rear end of the screen down upon the sand treating belt it and to prevent accidental discharge of the screened sand out of the rear end of the apparatus. Preferabl the sides of the screening unit if are enclosed by providing sections of sheet metal 55 which ex tend between the front and rear uprights, with their lower extremities overlapping the side walls of the hopper 29. It is to be understood that there is sufficient clearance between these plates and the sides of the screen to prevent accidental contact between these elements when the screen is in operation.

The screening unit 52 is constructed and designed to constitute a separate unit which may be easily and quickly applied to and removed from the sand conditioning unit H. This is desirable, since in some instances it might not be necessary to screen the material before it is deposited upon the sand treating belt 44. In this connection each set of front and rear uprights 2| and 22 are connectedtogether by means of a longitudinally extending frame member 66. This frame member is preferably of angle iron formation in cross section with its lower flange adapted to be supported upon the top longitudinal rails 67 of the sand treating unit (see Figure 3). Suitable bolts 63 or other fastening elements are employed to detachably secure the screening mechanism upon the sand treating mechanism. The arrangement-is such that the screening mechanism may be quickly detached and removed as a unit from the sand treating mechanism by removing the fastening elements 68. It is to be understood that any suitable number of fastening elements may be employed although I have found that one set of front and rear elements are sufficient to eifectively secure the screening unit in operative position. It is to be further understood that, in addition to removing the fastening elements 68, the upper end of the rod 46 must be detached from the screen. This may be easily accomplished by loosening the nut 49 and permitting the shank $9 of the ball 41 to be removed from the end of the bar 50.

It will be observed that when the screening unit [2 is applied to the sand treating unit, the arrangement is such that the front portion of the screen will be received between the side walls of the hopper 20. The frames 35 and 42 are made narrower at their front ends to permit this arrangement so that there will be no accidental clashing or contact between the sides of the screen and the sides of the hopper 29 when the screen is in operation.

The motor [8 is preferably connected to the shaft I1 by. means of a belt (not shown) and any suitable means may be employed to adjust the motor on the frame to take up any slack in the belt when necessary. In this connection the motor casing is mounted in the bracket 69 which is slidably supported on the main frame below the belt It. The bracket is provided with a threaded bolt is which passes through an opening in a flange H in the frame structure and is rigidly secured thereto by means of the nuts 12. When it is desired to adjust the motor, it is merely necessary to loosen the nuts l2 and permit the bracket E59 to slide in the main frame.

The apparatus is mobile and adapted for movement from place to place as desired. In this connection, front and rear wheels 13 and M support the frame l3 and a handle 75 is connected to the front wheel axle whereby the apparatus may be transported from one location to another. I

From the foregoing it will be apparent that I have provided a compact and efficient sand conditioning apparatus including a screening unit which may be easily and quickly applied and detached from a sand treating unit. The only change in the sand treating mechanism that is necessary to accommodate the screening mech anism is to provide the front shaft of the belt rotating mechanism with an extension having the cam or eccentric 4 A shaft having an extension of this character may be supplied as a replacement to the usual front shaft and may be readily substituted therefor in the event that it is desired to utilize the present screening mechanism with a sand treating unit.

It is to be uhderstood that the invention is not limited to the details of construction shown in the drawings, and that the phraseology employed in the specification is for the purpose of description and not of limitation,

I claim:

1. In an apparatus of the class described, a frame having front and rear uprights adapted to be detachably mounted on a sand conditioning unit, front and rear cross bars connecting said uprights, a screen pivotally mounted on said frame to swing about a longitudinal axis between said cross bars and adapted to screen sand above the sand conditioning unit, the connection between the front of the screen and the front cross bar comprising a universal joint, and means for adjustably mounting the rear cross bar between the rear uprights whereby the screen may be adjusted in the frame about its front pivot.

2. In an apparatus of the class described, a

frame having front and rear uprights adapted to be detachably mounted on a sand conditioning unit, front and rear cross bars connecting said uprights, a screen pivotally mounted on said frame to swing about a longitudinal axis between said cross bars and adapted to screen sand above the sand conditioning unit, the connection between the front of the screen and the front cross bar comprising a universal joint, and means for adjustably mounting the rear cross bar between the rear uprights whereby the screen may be adjusted in the frame about its front pivot, said means including sets of arcuately arranged holes in the rear uprights, said rear cross bar having spaced holes adapted to register with the holes in the rear uprights, and fastening means engageable with the holes in said uprights and cross bars.

3. In an apparatus of the class described, a frame having front and rear uprights adapted to be detachably mounted on a sand conditioning unit, front and rear cross bars connecting said uprights, a hanger depending from the front cross bar and provided with a ball receiving socket, a screen positioned between said uprights, a ball securedl to the front of the screen and housed in said socket to permit universal movement of the front of the screen in the front cross bar, means for pivotaliy mounting the rear end of the screen in the rear cross bar, and means for adjustably mounting the rear cross bar between the rear uprights whereby the screen may be adjusted in the frame about its front pivot.

4. In an apparatus of the class described, a frame having front and rear uprights adapted to be detachably mounted on a sand conditioning unit, front and rear cross bars connecting said uprights, a hanger depending from the front cross bar and provided with a ball receiving socket, a screen positioned between said uprights, a ball secured to the front of the screen and housed in said socket to permit universal movement of the front of the screen in the front cross bar, means for pivotally mounting the rear end of the screen in the rear cross bar, and means for adjustably mounting the rear cross bar between the rear uprights whereby the screen may be adjusted in the frame about its front pivot, said means including sets of arcuately arranged holes in the rear uprights, said rear cross bar having spaced holes adapted to register with the holes in the rear uprights, and fastening means engageable with the holes in said uprights and cross bar.

5. In an apparatus of the class described a frame adapted to be mounted on a sand conditioning unit and having front and rear cross members, a screen pivotally mounted on said frame to swing about a longitudinal axis between said cross members and adapted to screen sand above the sand conditioning unit, the connection between one end of the screen and its respective cross member comprising a universal joint, and means for adjustably mounting the other cross member in the frame whereby the screen may be adjusted in the frame about its other pivot, said means including a set of arcuately arranged holes in the frame, said last mentioned cross member having a hole adapted to register with the holes in said frame, and fastening means engageable with the holes in said cross member and frame.

6. In an apparatus of the class described, a frame having front and rear uprights adapted to be detachably mounted on a sand conditioning unit, front and rear cross bars connecting said uprights, a pair of hangers depending from the front and rear cross bars, each provided with a ball receiving socket having a central opening of less width than the diameter of the socket, a screen positioned between said uprights, and a set of balls, each journalled in one of said sockets and having a shank projecting through the central opening in its respective socket and detachably secured to one end of the screen whereby the latter is pivoted about a longitudinal axis in the frame.

7. In an apparatus of the class described, a frame having front and rear uprights adapted to be detachably mounted on a sand conditioning unit, front and rear cross bars connecting said uprights, a pair of hangers depending from the front and rear cross bars, each provided with a ball receiving socket having a central opening of less width than the diameter of the socket, a screen positioned between said uprights, brackets secured to the front and rear of said screen, each provided with a tapered opening, and a set of balls, each positioned in one of said sockets and having a shank projecting through the central opening in its respective socket and also through one of the tapered bracket openings, and fastening elements removably secured to the free ends of the shanks for detachably securing the balls in the sockets and the screen in the frame.

STANLEY B. DAVIES. 

